. Animal life as affected by the natural conditions of existence. Animal ecology. 220 THE INFLUENCE OF INANIMATE SURROUNDINGS, hindrances, whicli miglit be opposed to the growth, in any spot, of much larger masses of coral, -would check or modify their growth in the same way. I may for the present postpone the application of the prin- ciple thus arrived at; but it will repay our trouble if we direct our attention to some other phenomena observable in these same galls. The walls of the leaf-shaped excrescences that. Fig. e7.—Sideropora palnmfa, with a gall which is hardly visiblo from outside,
. Animal life as affected by the natural conditions of existence. Animal ecology. 220 THE INFLUENCE OF INANIMATE SURROUNDINGS, hindrances, whicli miglit be opposed to the growth, in any spot, of much larger masses of coral, -would check or modify their growth in the same way. I may for the present postpone the application of the prin- ciple thus arrived at; but it will repay our trouble if we direct our attention to some other phenomena observable in these same galls. The walls of the leaf-shaped excrescences that. Fig. e7.—Sideropora palnmfa, with a gall which is hardly visiblo from outside, btit shows a distinct fissure dividing the two lialves of the closed gall. form them bear polyps not only on the outer surface, but on the inner surface as well; this is proved by the fact that both are closely covered by little depressions, which, from their structure, can only have been formed by polyps. Now, as the polyps situated in the cavity were just as much exposed to the effects of the current as those on the margin of the fissure, they must show the traces of this influence, if indeed any such influence has been exercised during the growth of the gall. This is, in fact,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Semper, C. (Carl), 1832-1893. New York, D. Appleton
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